aside {
    width: 180px;
    padding: 10px;
    margin-right: -10px;
    margin-top: -53px;
    float: right;
    border-left: 1px solid black;
    border-bottom: 1px solid black;
    border-bottom-left-radius: 10px;
    background-color: white;
    margin-left: 10px;
    text-align: left;
}

aside input[type=submit] {
    float: right;
    display: inline-block;
    margin-right: 4px;
}